Abstract
GSK3β was identified as the kinase that phosphorylates glycogen synthase but is now known to be involved in multiple signaling pathways. GSK3β prefers prior phosphorylation of its substrates. We present the structure of unphosphorylated GSK3β at 2.7 Å. The orientation of the two domains and positioning of the activation loop of GSK3β are similar to those observed in activated kinases. A phosphate ion held by Arg 96, Arg 180 and Lys 205 occupies the same position as the phosphate group of the phosphothreonine in activated p38γ, CDK2 or ERK2. A loop from a neighboring molecule in the crystal occupies a portion of the substrate binding groove. The structure explains the unique primed phosphorylation mechanism of GSK3β and how GSK3β relies on a phosphoserine in the substrate for the alignment of the β- and α-helical domains.
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Acknowledgements
We thank K.P. Wilson for his advice, support and help in the preparation of the manuscript, R. Petrillo for protein expression and G. McDermott from Lawrence Berkeley Laboratories for help with data collection. We are grateful to V.L. Sato, J.A. Thomson, M.A. Murcko and M.S.-S. Su for their critical comments on the manuscript.
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ter Haar, E., Coll, J., Austen, D. et al. Structure of GSK3β reveals a primed phosphorylation mechanism. Nat Struct Mol Biol 8, 593–596 (2001). https://doi.org/10.1038/89624
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DOI: https://doi.org/10.1038/89624
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